Answer:
All living organisms respire. Cells need and use the energy that is formed through this process to assist with life processes in order for organisms to survive and reproduce. Oxygen and carbon dioxide are the main gases involved in aerobic respiration. These conditions are called gas exchange surfaces.
Explanation:

The Correct choice is C. <u>Anaphlactic</u> <u>shock</u>
Disease caused by massive release of histamine is Anaphlactic shock.
Answer:
Electricity generation
Explanation:
Coal is burnt to release high amount of energy which is further used to convert water into steam. The steam produced turns the turbines thus generating electricity.
Answer:
Leaves are the site of the food making process called photosynthesis. In this process, carbon dioxide and water in the presence of chlorophyll (the green pigment) and light energy are changed into glucose which is sugar. This energy rich sugar is the source of food used by most plants.
Explanation:
the answer is africa
Explanation:
The maximum increase in the population can be seen in case of Africa.
In the year 2010 the change is approximately 1000 as the population changed from the 1000 to 2000 during this year.
The graph seems to give a curve same like that of projectile motion. The graph shows the Africa to have increase in its population over a period of time.